关于html selection 的经典示例
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>光标控制器</title> <script type="text/javascript"> function CursorControl(a){ this.element=a; this.range=!1; this.start=0; this.init(); } CursorControl.prototype={ init:function(){ var _that=this; this.element.onkeyup=this.element.onmouseup=function(){ this.focus(); if(document.all){ _that.range=document.selection.createRange(); }else{ _that.start=_that.getStart(); } } }, getType:function(){ return Object.prototype.toString.call(this.element).match(/^\[object\s(.*)\]$/)[1]; }, getStart:function(){ if (this.element.selectionStart || this.element.selectionStart == ‘0‘){ console.log(this.element) console.log(window.getSelection()) console.log(window.getSelection().getRangeAt(0)) return this.element.selectionStart; }else if (window.getSelection){ console.log(window.getSelection()); console.log(window.getSelection().getRangeAt(0)) var r = document.createRange(); console.log(r) var rng = window.getSelection().getRangeAt(0).cloneRange(); rng.setStart(this.element,0); return rng.toString().length; } }, insertText:function(text){ this.element.focus(); if(document.all){ document.selection.empty(); this.range.text = text; this.range.collapse(); this.range.select(); } else{ if(this.getType()==‘HTMLDivElement‘){ this.element.innerHTML=this.element.innerHTML.substr(0,this.start)+text+this.element.innerHTML.substr(this.start); }else{ this.element.value=this.element.value.substr(0,this.start)+text+this.element.value.substr(this.start); } } }, getText:function(){ if (document.all){ var r = document.selection.createRange(); document.selection.empty(); return r.text; } else{ if (this.element.selectionStart || this.element.selectionStart == ‘0‘){ var text=this.getType()==‘HTMLDivElement‘?this.element.innerHTML:this.element.value; return text.substring(this.element.selectionStart,this.element.selectionEnd); } else if (window.getSelection){ return window.getSelection().toString() } } } }; var c1,c2; window.onload=function(){ c1 = new CursorControl(document.getElementById(‘text‘)); c2 = new CursorControl(document.getElementById(‘editdiv‘)); }; function fn1(str){ c1.insertText(str); } function fn2(str){ c2.insertText(str); } function fn3(){ alert(c1.getText()); } function fn4(){ alert(c2.getText()); } </script> </head> <body> <input type="button" value="插入字符串 {文本1}" onclick="fn1(‘{文本1}‘);"/> <input type="button" value="获取选中的文本" onclick="fn3();"/><br/><br/> <div> <textarea id="text" cols="50" rows="5">这里是文本框</textarea><br/><br/> </div> <input type="button" value="插入字符串 {文本2}" onclick="fn2(‘{文本2}‘);"/> <input type="button" value="获取选中的文本" onclick="fn4();"/><br/><br/> <div id="editdiv" contentEditable="true">这里是一个可编辑层</div><br/> </body> </html>
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